Broaching splines.
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Previously:
https://www.homemadetools.net/forum/...027#post214047
https://www.homemadetools.net/forum/...642#post201524
https://www.homemadetools.net/forum/...074#post168546
https://www.homemadetools.net/forum/...754#post223500
https://www.homemadetools.net/forum/...663#post216225
